They're in fort independence (south, SW of megaton). its in their weapon vault, one thing, u have to pick the lock to it, its hard so, u might not b able to do it. but once u get in there, take a left and turn into the only door u can and go down the stairs and enter the door at the botttom, then you'll come up to a door the nedds to be hacked, jus go into the desk nect to it and get the access code thats in it, also, they're going to attack u on sight, that also means n e outcasts u might find in the wastes 2, go down the spiral stairs and go through another door, then you'll come up to a split in the hallway, if u have good hacking skills take a left and find the turret control conseol, and deactivate it, but if not jus take the right and shoo them wahen u get 2 them. the armory is at the bottom of the stairs and is the right door, the left door is some doctors room. once you pick the lock to weapon armory, you'll find alot of guns along with the alien power cells found in the ammo boxes on the table.